origin of "up & adam"

Here's a bit about the origin of a sound-alike phrase:

"Q. Where'd we get the phrase 'Up and at 'em!'?

A. From the Duke of Wellington's battle order at Waterloo: 'Up,
guards, and at 'em.' Many a quotation survives, but few survive
intact."

http://www.siliconvalley.com/mld/montereyherald/living/8347526.htm

That sound authoritative, but I bet there is no contemporary report
from the early  19th century that quoted the Great Duke with the
contraction.
I was going to suggest that it was said the very first time the huddle
was used in football, but, of course, I have no reference for that
either.

Thanks! that is the answer